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Apple may have helped innovate the complex tax structure that allows it to minimize its foreign taxes, but it's far from alone. Four of Apple's closest peers also do likewise.

On Tuesday, Apple (NASDAQ:AAPL) was grilled on Capitol Hill over its aggressive (and legal) tax minimization strategy. The company took some heat over its complex structure of Irish subsidiaries intended to minimize taxes on international sales.

The most important thing for investors to remember, however, is that Apple is far from alone -- it just happens to be the most prominent example, painting a big target on its back in the eyes of lawmakers. The real issue is the broken U.S. corporate income tax system, which many American multinational companies similarly maneuver around.

Four of the Mac maker's direct peers similarly use the Irish strategy (or some variant), referred to as the "Double Irish With a Dutch Sandwich," which Apple helped pioneer decades ago. This method relies on an Irish legal concept that allows companies to avoid taxes if they're functionally managed from another country.

Everybody's doin' itAccording to Bloomberg, Google (NASDAQ:GOOGL) also has foreign subsidiaries set up for the same purpose, Google Ireland (based in Ireland) and Google Ireland Holdings (based in Bermuda). An estimated 88% of Google's international sales are attributed to Google Ireland. The Google Netherlands Holdings subsidiary has since been closed, and the Bermuda-based Google Ireland Holdings officially manages the Google Ireland subsidiary. Google generated $7.1 billion in revenue from outside the U.S. last quarter, or 55% of its total. That shows how much international tax minimization may help Big G.

An older Bloomberg report also noted that Microsoft uses the Double Irish. Since the method favors software companies with broad intellectual property portfolios, Microsoft is a prime candidate for its international operations.

Last year, The Guardianreported that social networker Facebook (NASDAQ:FB) also likes the Double Irish. All international profits are channeled into Facebook Ireland, which reportedly paid just $4.4 million in taxes on profits of over $1.2 billion in 2011. Facebook's international sales composition is similar to Google's. The social network generated 53% of revenue outside of the U.S. last quarter, although Facebook is much smaller than Google, with this total coming in at $777 million. Most of Facebook's user growth is also coming from abroad. The company only added 2 million monthly active users, or MAUs, in North America (including Canada) last quarter. That's just a small portion of the 54 million total increase in worldwide MAUs. Most of these MAU gains are in emerging markets.

Amazon.com (NASDAQ:AMZN) uses a similar structure, but instead routes funds through an operating unit in Luxembourg, according to Reuters. Even though Luxembourg technically imposes a 30% tax rate, Amazon was able to pay just $37.5 million in taxes in 2011. Amazon's business has less presence abroad in comparison: 42% of last quarter's revenue was international. Outside of e-books, Amazon has less international content offerings than in the U.S., so its business mix abroad includes more general merchandise.

Apple may have helped innovate the complex legal structure, but it's certainly not the only one to use it.

Fool contributor Evan Niu, CFA, owns shares of Apple. The Motley Fool recommends Amazon.com, Apple, Facebook, and Google. The Motley Fool owns shares of Amazon.com, Apple, Facebook, Google, and Microsoft. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.

Author

Evan is a Senior Technology Specialist at The Motley Fool. He was previously a Senior Trading Specialist at Charles Schwab, and worked briefly at Tesla. Evan graduated from the University of Texas at Austin, and is a CFA charterholder.